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QSC Audio USA 900 Manual

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User reviews and opinions

Comments to date: 5. Page 1 of 1. Average Rating:
mjgatford 6:25pm on Tuesday, September 28th, 2010 
Alot of storage space and easy to use. Lots of Storage, Reliable Performance, Sleek/Compact, Easy To Set Up, Great Sound, Simple Controls
johnrobot 7:01pm on Monday, July 26th, 2010 
I have owned this iPod for over a month from ...  Good touch screen S p e a k er Fast, cheap, extendable 1st Gen. = No bluetooth Fast, cheap, extendable 1st Gen. = No bluetooth
Auka 4:48am on Saturday, July 24th, 2010 
my idea of the ipod touch i am going to tell u this loud and clear the ipod touch is 200 dollars but its totally worth for anyone any age it has anyth... Great accessory This is a great anti-glare screen protector for my i-touch. It is a little pricey.
wrzek 1:39pm on Tuesday, July 6th, 2010 
Most incredible device this 43 year old will probably ever own! My title says it all, however. Good Arrived just as described. I rated the ease of use very low because I cannot figure out how to work the wi-fi.
OOfan 1:27am on Thursday, June 17th, 2010 
Enjoyed using this well. I would recommend it to others and would purchase it again. Did a lot of on-line shopping before purchasing. this is a cool mp3 player, It looks very good and I like it very much.but I think the price of it is a little expensive good expensive

Comments posted on are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.




550 watts per channel at 2 ohms

USA 900

450 watts per channel at 4 ohms Built-in limiting (defeatable) for speaker protection Selectable high-pass filter (30 Hz, 50 Hz, or out) Active balanced inputs Neutrik Combo input connectors accommodate both 1/4 TRS and XLR Barrier strip inputs Touch-proof binding post outputs Two-speed fan cooling LED clip indicators Patented Output Averaging short circuit protection Stereo, bridged mono, or parallel operation QSC reliability and audio performance Made in USA 3-year warranty PLUS optional 3-year extended warranty
he USA 900, a member of QSCs world-wide best-selling line of amplifiers, is now even
clip indicators, mono-bridging switch, and active balanced inputs. The USA 900 is ideal for live sound specialists, system installers, and other professionals who demand QSCs legendary reliability and audio quality.
better. The USA Series now offers even more
value and performance: Neutrik Combo input connectors (1/4 and XLR), selectable limiters, variable low-frequency filters, and even more power in a new rugged, all-steel chassis. Other standard features include comprehensive amplifier and load protection, ample heat sinks,
QSC Audio Productsthe leader in amplifier technology.

LOAD Stereo (W/Ch)

20Hz-20kHz, 0.1% THD (typical)

1kHz, 1% THD (typical)


240 watts

270 watts 450 watts 550 watts 540 watts 900 watts

480 watts

1675 MacArthur Boulevard Costa Mesa, California 92626-1468 USA Phone: 714/754-6175 Fax: 714/754-6174

USA 900 Specifications

OUTPUT POWER (per channel, typical)
8 ohms, 20 Hz to 20 kHz, 0.1% 8 ohms, 1kHz, 1% 4 ohms, 1 kHz, 1% 2 ohms, 1 kHz, 1% THD, 240 watts THD, 270 watts THD, 450 watts THD, 550 watts
The power amplifier shall contain all solid-state circuitry, using complementary silicon semiconductors. The amplifier shall operate from 50-60 Hz AC power, with voltages of 100, 120, or 240 Vac. The amplifier shall operate from a normal household AC outlet, drawing less than 1030 VA when driven with random program material at 1/8 rated power into four ohm loads. The amplifier shall be supplied with a single molded AC cord having an appropriate AC plug for the intended operating voltage.
OUTPUT POWER (bridged mono)
16 ohms, 1 kHz, 8 ohms, 1 kHz, 1% 1% THD, 540 watts THD 900 watts


SMPTE-IM, less than 0.025%


20 Hz to 20 kHz, +0/-1 dB, 1 watt


Greater than 200
The amplifier shall contain two independent channels. Each channel shall have independent protective circuitry against open circuit, short circuit, or reactive loads, and the remaining channel shall continue to operate if one channel fails. A muting circuit shall provide three seconds of muting after turn-on, and shall mute within 1/4 second after turn-off or loss of power, to protect the load against turn-on or turn-off thumps. Self resetting thermal shutdown shall protect the circuitry against temperatures in excess of 90C, and a front panel resettable circuit breaker or fuse shall protect against AC overloads. Each channel of the amplifier shall have an independently defeatable limiter. Each channel shall also have bypassable highpass filtering, with independently selectable -3 dB frequencies of 30 Hz or 50Hz. The limiter and high pass filter controls shall be on an 8-position DIP switch on the amplifiers rear panel. Each channel of the amplifier shall typically be capable of meeting the following performance criteria, with both channels driven simultaneously, unless otherwise stated: Output power, 8 ohms per channel, 20 Hz-20 kHz, less than 0.1% distortion, at least 240 watts rms per channel. Output power, 4 ohms per channel, 1 kHz, less than 1% distortion, at least 450 watts rms per channel. Frequency response shall be 20 Hz-20 kHz + 0, - 1 dB at 1 watt output. SMPTE IM distortion shall be less than 0.025% at rated power, 8 ohms, and less than 0.05% at rated power, 4 ohms. IHF damping factor shall be at least 200. Signal to noise, below rated output, shall be at least 104 dB (A weighted). Dynamic headroom at 8 ohms shall be at least 2 dB. The voltage gain shall be 32 dB at full gain. The input sensitivity for rated 8 ohm power shall be 1.16 Vrms. Input impedance shall be 20 kilohms balanced and unbalanced noninverting, 10 kilohms unbalanced inverting. Balanced, bridging input circuit shall be standard, and the amplifier shall meet all performance criteria in the balanced or unbalanced mode. The amplifier shall have built-in fan cooling, with automatic two-speed operation. Air flow shall be from the back to front. Each channel shall have the following controls, indicators, and connectors: Rear mounted gain control calibrated in dB. Clipping indicator, responding proportionally to any distortion in excess of 0.1%. Balanced/unbalanced input jack of the Neutrik Combo (combined 1/4 TRS and XLR). Balanced input of the barrier strip screw terminal type. Speaker terminals of the "touch proof" binding post type. In addition, the chassis shall feature a rear mounted mono-bridging switch, front mounted AC switch and circuit breaker, or fuse in some export locations, mounting positions on the rear for optional 70 V output transformers, and built-in rack mounting ears. The chassis shall mount in a 19" rack, occupying 3 rack spaces (5.25"). Chassis depth behind the rails shall be 8.5" plus 1 in allowance for the binding posts. Weight shall be 34 Ib. The amplifier shall be the QSC Model USA 900.

DYNAMIC HEADROOM: 2 dB at 8 ohms NOISE: 104 dB below rated output (A weighted) SENSITIVITY: 1.16 Vrms for rated power (8 ohms) VOLTAGE GAIN: 40 (32 dB) INPUT IMPEDANCE: 10K unbalanced, 20K balanced CONTROLS:
Front: Back: AC Switch, AC Circuit Breaker Stereo/Bridge Switch/Ch 1 and Ch 2 Gain Knobs 8 Position DIP Switch for Filter & Limiter


PWR-ON: CLIP: Green LED Red LED, 1 per channel
CONNECTORS: (each channel)
Input: Barrier strip and Neutrik "Combo" 1/4" TRS and XLR, tip positive Speakers: "Touch proof" binding posts
COOLING: Two-speed fan, rear-to-front air flow. AMPLIFIER PROTECTION:
Full short circuit, open circuit, ultrasonic, and RF protection. Stable into reactive or mismatched loads.


On/off muting and DC-fault protection.


Complementary linear outputs.
Normal Operation: 4 ohms per channel: less than 8.6 amps, 120 Vac (1030 VA)


19.0" (48.3 cm) rack mounting 5.25" (13.3 cm) tall (3 spaces) 9.5" (24.1 cm) deep
WEIGHT: 34 Ibs (15.4 kg) net, 37 Ibs (16.8 kg) shipping
Output Averaging short circuit protection (US Patent 4,321,554) SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.




OT -600

Output Autoformer
Basic Description The OT-600 is a heavy-duty step-up autoformer accessory that adapts any power amplifier output with a maximum voltage of approximately 40 to 50 volts to drive a 70-volt distributed line with up to 600 watts. Three voltage taps let you choose the one most appropriate for the amplifier. The OT-600 can also be used to drive a 100-volt line when used with an amplifier with a maximum output level of 55 to 70 volts. Conversely, the OT-600 can be used as a high-power speaker transformer, driving loudspeakers with up to 600 watts from a 70-volt distributed line. The OT-600 autoformer is compatible with any amplifier rated at approximately 350 to 650 watts at 4 ohms. It has built-on brackets for convenient mounting on a panel or in an equipment rack. Compatible amplifier models USA 900 and USA 1310 RMX 1450 MX 1500a and MX 2000a PLX 1602 PowerLight 1.0HV, PowerLight 1.4, and PowerLight 1.8 CX 502 and CX 404 DCA 1622 and DCA 1644 Any amplifier rated at approximately 350 to 650 watts at 4 ohms Features Adapts low-impedance amplifiers to drive 70-volt lines Rugged, heavy-duty construction handles up to 600 watts Low insertion lossless than 1 dB Three voltage taps to accommodate any amplifier output voltage from 40 to 50 volts Also suitable for use as a high-power speaker transformer handling up to 600 watts Can also be used with amplifiers from 55 to 70 volts to drive 100-volt lines at up to 600 watts
1675 MacArthur Boulevard Costa Mesa, CA 92626 Ph: 800/854-4079 or 714/957-7100 Fax: 714/754-6174
Specifications subject to change without notice.
O T - 0 S P E C I F I C AT I O N S
GENERAL INFORMATION Frequency response Transformer type Distortion, 35 Hz15 kHz Connectors Power capacity Insertion loss Dimensions (h w d) Weight Mounting centers Voltage taps


35 Hz15 kHz, 1 dB Autoformer with EI laminated core <0.1% @ 300 watts (6.3 mm) male quick-disconnect Approximately 200 to 650 watts Less than 1 dB 3.75 4.50 4.00; 95.2 mm 114.3 mm 101.6 mm 10 lb; 4.5 kg 3.00 3.75; 76.2 mm 95.2 mm 40, 45, and 50 volts

70V out

power amplifier
OT-600 used as an output transformer

50V 45V 40V

70V distributed line

0V (common)

OT-600 used as a speaker transformer

70V in 8 4

312W 250W 200W 625W 500W 400W
0.375 0.25" 9.5 6.3 mm


3.00" 76.2 mm
QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, CA 92626 Ph: 800/854-4079 or 714/957-7100 Fax: 714/754-6174

3.75" 95.2 mm



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